Preliminary study results suggest single dose of BNT162b2 Covid-19 vaccine protects against asymptomatic SARS-CoV-2 infection

Results (not peer reviewed) from a 2-week study of asymptomatic Covid-19 screening (PCR) of healthcare workers at Cambridge University Hospitals NHS Foundation Trust found positive tests in 0.80% of unvaccinated staff and 0.20% of those who had been vaccinated >12 days previously

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